/*
** $Id: ldo.h,v 2.20 2011/11/29 15:55:08 roberto Exp $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/

#ifndef ldo_h
#define ldo_h


#include "lobject.h"
#include "lstate.h"
#include "lzio.h"


#define luaD_checkstack(L,n) if (L->stack_last - L->top <= (n)) \
        luaD_growstack(L, n); else condmovestack(L);


#define incr_top(L) {L->top++; luaD_checkstack(L,0);}

#define savestack(L,p)    ((char *)(p) - (char *)L->stack)
#define restorestack(L,n) ((TValue *)((char *)L->stack + (n)))


/* type of protected functions, to be ran by `runprotected' */
typedef void (*Pfunc)(lua_State *L, void *ud);

LUAI_FUNC int luaD_protectedparser(lua_State *L, ZIO *z, const char *name,
                                   const char *mode);
LUAI_FUNC void luaD_hook(lua_State *L, int event, int line);
LUAI_FUNC int luaD_precall(lua_State *L, StkId func, int nresults);
LUAI_FUNC void luaD_call(lua_State *L, StkId func, int nResults,
                         int allowyield);
LUAI_FUNC int luaD_pcall(lua_State *L, Pfunc func, void *u,
                         ptrdiff_t oldtop, ptrdiff_t ef);
LUAI_FUNC int luaD_poscall(lua_State *L, StkId firstResult);
LUAI_FUNC void luaD_reallocstack(lua_State *L, int newsize);
LUAI_FUNC void luaD_growstack(lua_State *L, int n);
LUAI_FUNC void luaD_shrinkstack(lua_State *L);

LUAI_FUNC l_noret luaD_throw(lua_State *L, int errcode);
LUAI_FUNC int luaD_rawrunprotected(lua_State *L, Pfunc f, void *ud);

#endif

